Reset Drupal 8 content type display format

Let's say you've made changes to your content type display format (such as the default display mode) and now it will not render (times out).

How do you reset it?

This requires that you have a backup prior to your display format changes that are now not working.

Revert to a prior backup.

Export a single item

/admin/config/development/configuration/single/export

Select Entity view display 

Choose your content type and display mode.

Save this in a text file.

Revert to your current back up.

Restore the configuration using single import.